The University of Tennessee at Chattanooga hosted the event, "The Science of 9/11," which began with a moment of silence for the families who lost loved ones.
The discussion "is an opportunity to illustrate the application of the scientific method to a real life event that most Americans remember exactly where they were," said UTC professor of anthropology Lyn Miles, one of the event's coordinators.
There are also more than 1,500 architects and engineers who have raised scientific questions over the collapse of the World Trade Center and are calling for a full investigation of 9/11, and it's worthwhile to discuss why, she added.
The school showed the documentary "Architects & Engineers 9/11 Truth," also the name of the nonprofit that says the collapse of the buildings was not caused by the impact of the planes but by explosives or controlled demolition.
Close to 300 people attended the event, many university students, who often cheered the comments made from one of the panelists, David Johnson, a University of Tennessee at Knoxville urban planning professor emeritus and urban engineering expert, who also calls for a new investigation of what happened on that day when almost 3,000 people were killed.